United States Army Corps of Engineers Ratings API

openapi: 3.1.0
info:
  title: CWMS Data Basins Ratings API
  description: The Corps Water Management System (CWMS) Data API provides a RESTful interface for accessing water management data from the U.S. Army Corps of Engineers. This includes time series data, locations, levels, ratings, forecasts, projects, turbines, gates, and water supply information for USACE-managed water resources across the United States.
  version: 3.0.0
  contact:
    name: USACE CWMS Data API Support
    url: https://github.com/USACE/cwms-data-api
  license:
    name: MIT
    url: https://github.com/USACE/cwms-data-api/blob/develop/LICENSE.md
  x-tags:
  - Water Management
  - Federal Government
  - Hydrology
  - Engineering
servers:
- url: https://cwms-data.usace.army.mil/cwms-data
  description: Production CWMS Data API
- url: https://water.usace.army.mil/cwms-data
  description: Water Data Platform
tags:
- name: Ratings
  description: Rating tables for converting between measured values
paths:
  /ratings:
    get:
      operationId: getRatings
      summary: Get Ratings
      description: Returns rating tables used to convert between measured values (e.g., stage to flow, gate opening to discharge).
      tags:
      - Ratings
      parameters:
      - name: office
        in: query
        required: false
        description: Three-character USACE district office code
        schema:
          type: string
      - name: rating-id
        in: query
        required: false
        description: Rating identifier (supports CWMS wildcards)
        schema:
          type: string
      - name: start
        in: query
        required: false
        description: Start of effective date range
        schema:
          type: string
      - name: end
        in: query
        required: false
        description: End of effective date range
        schema:
          type: string
      - name: timezone
        in: query
        required: false
        description: Timezone for date/time values
        schema:
          type: string
      - name: format
        in: query
        required: false
        description: Response format
        schema:
          type: string
      responses:
        '200':
          description: Rating tables
          content:
            application/json:
              schema:
                type: object
        '400':
          $ref: '#/components/responses/BadRequest'
components:
  responses:
    BadRequest:
      description: Bad request — invalid parameters or missing required fields
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      type: object
      properties:
        message:
          type: string
          description: Human-readable error description
        status:
          type: integer
          description: HTTP status code
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: JWT Bearer token for authenticated operations (create, update, delete). Obtain a token from the CWMS authorization endpoint.